问题标题:
用简便方法计算并验算.5700÷30=3600÷900=750÷40=
问题描述:
用简便方法计算并验算.
5700÷30=
3600÷900=
750÷40=
钱东回答:
5700÷30
=570÷3
=190
验算:
190×30=5700;
3600÷900
=36÷9
=4
验算:
900×4=3600
750÷40
=75÷4
=18.75
18.75×40=750
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